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Description of Tarsonemus Parawaitei, a New Species

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Description of Tarsonemus Parawaitei, a New Species Systematic & Applied Acarology Special Publications (1998) 2, 1-28 Description of Tarsonemus parawaitei, a new species of Tarsonemidae (Acari: Heterostigmata) associated with orchard and ornamental plants in Europe, Australia and New Zealand JIN-SEONG KIM,l, 2 TING-KUI QIN,2 & EVERT E. LINDQUIST3 1 Permanent address: International Quarantine Cooperation Division, National Plant Quarantine Service, Ministry of Agriculture & Forestry, 433-1, Anyang 6-dong, Anyang City, Kyunggi-do 430-016, Korea. Email: [email protected] 2 Landcare Research, Private Bag 92 170, Auckland, New Zealand. Email: [email protected] 3 Biological Resources Program, Research Branch, Agriculture and Agri-Food Canada, Ottawa, ON KIA OC6, Canada. Email: [email protected] Abstract A new species of Tarsonemidae, Tarsonemus parawaitei, in the waitei-group of Tarsonemus is described and illustrated in detail from the adult female and male, larval female and male, and egg. The species is recorded from western Europe, Australia, and New Zealand. The species has two tibial solenidia on leg I of the adult female but only one on the adult male; this sexual dimorphism has not been reported in Tarsonemidae before, and warrants further investigation. Lindquist's (1978) key to the Tarsonemus waitei group is updated in light of our results. Key words: Tarsonemus parawaitei, new species, sexual dimorphism, Tarsonemus waitei group, Tarsonemidae, Acari Introduction During the 1996/97 summer, export of New Zealand apricots from Central Otago to Australia was temporarily suspended because of the presence of mites of a species of Tarsonemus (Acari: Tarsonemidae). The mites, initially identified by T.-K. Qin as a species in the Tarsonemus waitei group, were then sent to E.E. Lindquist for confirmation and further identification. Lindquist identified the mites as a new species identical to Tarsonemus setifer sensu Karl 2 Systematic & Applied Acarology Special Publications (1998) 2 (1965), a misidentification (Lindquist 1978). Since Lindquist held a record of this mite being present in Victoria, Australia, export of apricots from New Zealand to Australia was resumed. However, species of Tarsonemus are still a concern for the New Zealand apricot industry because export of summer fruits to Australia still requires clearance of mites other than T. setifer sensu Karl (G. F. McLaren, personal communication 1997). The objectives of this paper are to describe all postembryonic instars of T. setifer sensu Karl as a new species, T. parawaitei, and to characterise the differences between it and other species of the genus in the T. waitei group. Material and methods Specimens for the present study were collected mostly from apricot (Prunus armeniaca L.) in Central Otago, New Zealand. We also reared the mites on apricot fruits in culture to associate the male, female and immature instars. Specimens were cleared using Nesbitt's fluid and mounted in Hoyer's medium, one per slide, for microscopic study. Specimens from other parts of the world were also examined (see Material examined). Terminology follows that of Lindquist (1978, 1986a). Measurements are recorded in micrometers (Jlm) as a range, with the mean in parentheses. Body length is taken from the anterior margin to the posterior margin of the idiosoma, body width is measured at the widest part. The descriptive format also largely follows Lindquist (1978). Outlines of illustrations were made using an Olympus microscope with a drawing tube, and details were filled in using a Nikon E-800 microscope with phase contrast and differential interference contrast optical systems. Repository abbreviations (after Watt 1979): NZAC: New Zealand Arthropod Collection, Auckland, New Zealand; CNCI: Canadian National Collection of Insects and Arachnids, Agriculture and Agri-Food Canada, Ottawa, Canada; UQBA: University of Queensland Insect Collection, Brisbane, Australia. Tarsonemus parawaitei sp. nov. Tarsonemus setifer: Karl, 1965: 347, fig. 5; not Ewing, 1939 [misidentification] KIM, QIN & LINDQUIST: Tarsonemus parawaitei sp. nov. 3 T[arsonemus] sp. undescribed (=setifer sensu Karl): Lindquist, 1978: 1046 (key), fig. 8. Diagnosis Tarsonemus parawaitei can be distinguished from other species in the waitei group by the following combination of attributes: larva and adult with 3 setae on femur II; adult female with tergital setae d and e smooth and tapered like c 1 rather thanf, leg I with 2 tibial solenidia, sejugal apodeme always interrupted on both sides of midline and usually on the midline; adult male with sejugal apodeme continuous, metapodosomal ventral plate ornamented with fine puncta laterally and anterior to coxisternal plates III and IV, and with finely interrupted, longitudinal striae on plates III and IV; cupules im close to bases of setae e, tarsus with.ft' (instead of.ft") present, apodemes III connected with apodemes IV anteriorly; larva with sc2 barbed basally, suture on tergite C extending posterolaterally beyond base of c1. Adult female (Figs 1-6) Gnathosoma (Figs 1, 2). Gnathosomal capsule 1.2-1.3 (1.26) times longer than wide; dorsomedian apodeme prominent, extending from union basally with circumcapitular apodeme to at least level of insertion of dorsal gnathosomal setae; basal half of ventral surface with a pair of apodemes extending divergently from midlevel of pharynx basally to unite with circumcapitular apodeme, forming roughly an 'A' shape with the latter. Gnathosoma with dorsal pair of setae 14-17 (15.4) Jlm, slender, smooth, slightly longer than ventral pair; postpalpal pair of setae about 26 Jlm, but often inconspicuous because of their running along a lateral furrow of gnathosoma for most of their length, inserted on basalmost third of capsule and extending distad of insertions of other gnathosomal setae. Palps short, 8-10 (9.3) Jlm, slightly convergent, with 2 minute setae about 2 J.Lm; lateral femorogenual seta conical, stouter basally than dorsodistal tibiotarsal seta; ventrolateral distal process conspicuous and rounded. Chelicera! stylets short, straight, divergent basally and attached to basal levers. Pharynx with thick, heavily sclerotized, somewhat horseshoe-shaped lateral walls and with a pair of small, ellipsoidal, gland-like structures posteriorly. Dorsal idiosoma (Fig. 1). Idiosoma elliptical, 1.7-2.0 (1.73) times as long as wide, with dorsal shields unornamented. Prodorsal shield subtriangular, width 90-110 (104.2) Jlm, length 62-72 (67.0) Jlm, about 1.5 times as wide 4 Systematic & Applied Acarology Special Publications (1998) 2 posteriorly as long medially, with a conspicuous, trifid, crescentic apodeme posteromedially; anterior margin arc-shaped just slightly over base of gnathosoma; lateral margins slightly depressed and not covering the capitate bothridial sensilla. Stigmata opening on anterolateral margins of prodorsal shield posterolaterad of vertical setae (vi); distance between centres of stigmata and VI 6-7 (6.2) 11m; tracheal trunks extending posteriorly through atrium. Vertical setae (vi) 28-32 (29.9) 11m, less than half as long as scapular setae (scz); both pairs of setae slightly barbed. Scapular setae 69-78 (73.2) 11m, inserted slightly posteriad of midlevel of prodorsum, about 1.6 times as long as transverse distance between their insertions, and less than posterior width of prodorsal shield. Pits vz usually conspicuous, close to scz, about 2/3 along interval between bases of VI and scz, well posteriad of level of stigmata. Bothridial setae nearly round-capitate, finely spiculate. Setae of opisthosomal tergites with CI, c2, d and e smooth, slender, finely tapered, but f and h slightly barbed, thicker, weakly tapered; CI 18-20 (19.1) 11m, d 16-19 (18.0) 11m and e 15-18 (16.3) 11m, but cz clearly longest, 30-37 (33.9) 11m; f 13-15 (13.8) 11m, h 10-12 (10.2) 11m. Cupules ih well separated from alveoli of setae h (by about three times alveolar diameter of h). Dorsolateral extensions of coxisternal plates IV slightly overlapping tergite D laterally. Ventral idiosoma (Fig. 2). Prosternal apodeme extending posteriorly from its union with apodemes I nearly to level of medial extremities of apodemes II, uninterrupted, slightly forked, then expanded to form a faint diagonal structure as shown in Fig. 2, not connecting with sejugal apodeme posteriorly. Apodemes II not connecting medially with prosternal apodeme. Sejugal apodeme well developed, broken in three regions: a narrow interruption in middle, sometimes not very clear, and wide interruptions on either side of mid-portion. Coxal setae I a and 2a simple, inserted on posterior margin of apodemes I and II, respectively; I a 13-14 (13.6) 11m, 2a 14-19 (16.8) 11m. Apodemes III recurved at anteromedial extremities near coxal setae 3a, extending laterally only as far as their articulation with anterior extremities of trochanters III. Apodemes IV extending posterolaterally slightly beyond insertions of coxal setae 3b, reduced anteromedially and not connecting with each other. Poststemal apodeme between apodemes IV vestigial. Coxal seta 3a 16-19 (17.9) 11m, 3b 15-19 (16.2) 11m. Tegula moderately large, rounded, tongue-shaped, its basal width 19-24 (21.1) 11m, slightly more than twice that of trochanter IV. Lateral plates (posterolateral extensions of coxistemal plates IV) well separated medially beneath tegula. Aggenital plate roughly triangular, with anterior margin slightly convex and KIM, QIN & LINDQUIST: Tarsonemus parawaitei sp. nov. 5 posterior margin broadly rounded. Pseudanal plate (PS) subquadrate, sometimes projecting caudad of tergite H, with setae ps slender, smooth, slightly shorter than setae h. Legs (Figs 3-6). Legs I, II, and III similar in length (measured from tip of tarsal claw to base of femur, excluding trochanters): I 55-64 (60.0) !J.m, II 48-63 (57.7) !J.m, and III 58-64 (62.1) !J.m; leg IV 34-45 (40.1) !J.m, slender, about 2/3 as long as leg III, its femorogenu 25-33 (29.6) !J.m long, nearly 3 times as long as its tibiotarsus. Leg I with claw unguiform, on a well-developed apotele. Legs II and III each with broad, membranous pulvillus, and with paired claws symmetrically well developed.
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